The Night function is called by
Alarm.alarmRepeat(21,26,30, Night);
set at void setup ().
I'm assuming that hour () prints the present hour since digitalClockDisplay function bellow displays the time stamp.
void digitalClockDisplay(){
// digital clock display of the time
Serial.print(hour());
printDigits(minute());
printDigits(second());
Serial.print(" ");
Serial.print(day());
Serial.print(" ");
Serial.print(month());
Serial.print(" ");
Serial.print(year());
Serial.println();